#box{
    width: 750px;
    height: 170px;
    margin: 10px auto;
}

#ol{
    list-style: none;
    padding: 0;
    float: left;
}
#ol li{
    width: 170px;
    height: 170px;
    margin-right: 12px;
    border: 1px solid #ccc;
    float: left;

}

#ol li:hover{
    border: 1px solid #f00;
}
#big{
    display: none;
    position: absolute;
    width: 400px;
    height: 400px;
    border: 2px solid #ccc;
}
#big div{
    position: absolute;
    width: 400px;
    height: 400px;
    filter: alpha(opacity=30);opacity: .3;
    background:#fff url(../images/loading.gif) 50% 50% no-repeat;
}